.mt20 {
    margin-top: 20px;
}

.container {
    width: 90%;
    margin-left: 5%;
}


/*
 * 面向属性的 CSS
 */


/* 布局方式 */

.df {
    display: flex;
}

.fdc {
    flex-direction: column;
}

.jcsb {
    justify-content: space-between;
}

.jcsa {
    justify-content: space-around;
}

.f1 {
    flex: 1;
}

.fn {
    flex: none;
}

.aic {
    align-items: center;
}

.jcc {
    justify-content: center;
}

.ofs {
    overflow-y: scroll;
}

.mt20 {
    margin-top: 20px;
}

.mt10 {
    margin-top: 10px;
}

.mb20 {
    margin-bottom: 20px;
}

.mb10 {
    margin-bottom: 10px;
}

.br15 {
    border-radius: 15px;
}

.bgw {
    background: white;
}